• A communication pathway within a computer system that facilitates the exchange of data between the CPU, Main Memory, and IO Device

IO Bus Architecture

Shared Bus Architecture

  • Multiple IO Device uses the same wire to transfer data

Parallel Bus Architecture

  • Send each Word of data over multiple wires

Overhead of Synchronisation

Extra logic and overhead are involved to ensure data transferred over multiple IO Bus are re-arranged back its original form

Serial Bus Architecture

  • Sending data one Bit at a time, sequentially, over a single IO Bus
  • The current modern standard as of 2024, capable of delivering more data than other IO Bus Architecture
  • Common standards are PCI, USB and UART etc


No need to have complicated logic to handle synchronisation of many parallel busses like the Parallel Bus Architecture